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SPI requires three wires, unlike the I C bus. One line is for clocking; one is for an input data line, and one an output data line. Thus SPI is full duplex. These are the three bus lines: Serial data out (SDO), also called master out/slave in (MOSI) Serial data in (SDI), also called master in/slave out (MISO) Serial clock line (SCKL) There is no addressing, as with the I C bus. Each chip must be connected to the microcontroller via an individual GPIO pin. Using this line, the microcontroller signals with which device it would like to communicate. This signal is called slave select/chip select (SS/CS) or slave transmit enable (STE). The microcontroller functions as the master and provides the clock signal. The connected modules are the slaves. One bit will transfer per bus clock cycle. The transmission is done after the master sets the level of the chip select signal to the original state.

Probably the most important of these options are the [target] option, the f (file) option, and the D (property override) option. You will tend to find that most command-line NAnt usage will be of the following form: nant -f:mybuild.build -d:myproperty=foo domybuild This command would have the effect of running the mybuild.build build file, invoking target domybuild, and setting the value of myproperty to foo. Do not worry if you are confused about properties and targets: they are all covered in the next part of this chapter. The following is a more complete explanation of the options. For the purposes of demonstrating the effects of these options, we will be using the following build file, which is just a slightly more complex variation on the Hello World script: < xml version="1.0" encoding="utf-8" > <project name="CommandOptions" default="target3"> <description>A very simple build script</description> <property name="message" value="Hello World!"/> <echo message="Entering main target..."/> <echo message="Exiting main target..."/> <target name="target1" description="This is target1"> <echo message="Entering target1..."/> <echo message="Exiting target1..."/> </target>

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Now that you know how the SPI bus works, you re ready to learn how to program SPI devices with the .NET Micro Framework. SPI devices are represented by the Microsoft.SPOT.Hardware. SPI class (see Listing 5-19). Listing 5-19. The Microsoft.SPOT.Hardware.SPI Class using System; namespace Microsoft.SPOT.Hardware { public sealed class SPI : IDisposable { public SPI(SPI.Configuration config); public SPI.Configuration Config { get; set; } public public public public public public void void void void void void Dispose(); Write(byte[] writeBuffer); Write(ushort[] writeBuffer); WriteRead(byte[] writeBuffer, byte[] readBuffer); WriteRead(ushort[] writeBuffer, ushort[] readBuffer); WriteRead(byte[] writeBuffer, byte[] readBuffer, int readOffset);

<target name="target2" description="This is target2" depends="target1"> <echo message="Entering target2..."/> <echo message="${message}"/> <echo message="Exiting target2..."/> </target> <target name="target3" description="This is target3" depends="target2"> <echo message="Entering target3..."/> <echo message="Exiting target3..."/> </target> </project> Running this script with no options produces the following output: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2003 Gerry Shaw http://nant.sourceforge.net Buildfile: file:///CommandOptions.build Target(s) specified: target3 [echo] Entering main target... [echo] Exiting main target... target1: [echo] Entering target1... [echo] Exiting target1... target2: [echo] Entering target2... [echo] Hello World! [echo] Exiting target2... target3: [echo] Entering target3... [echo] Exiting target3... BUILD SUCCEEDED Total time: 0.1 seconds. Output completed (0 sec consumed) - Normal Termination A very brief explanation of the script is as follows. Again, the details of this will be investigated later. The script contains three subtargets: target1, target2, and target3. Additionally, it has a task in the main body of the project and so this is executed first when the build file is run.

public void WriteRead(ushort[] writeBuffer, ushort[] readBuffer, int readOffset); public enum SPI_module { SPI1 = 0, SPI2 = 1, SPI3 = 2, SPI4 = 3, } public class Configuration { public readonly Cpu.Pin ChipSelect_Port; public readonly bool ChipSelect_ActiveState; public readonly uint ChipSelect_SetupTime; public readonly uint ChipSelect_HoldTime; public readonly bool Clock_IdleState; public readonly bool Clock_Edge; public readonly uint Clock_RateKHz; public readonly SPI.SPI_module SPI_mod; public Configuration(Cpu.Pin ChipSelect_Port, bool ChipSelect_ActiveState, uint ChipSelect_SetupTime, uint ChipSelect_HoldTime, bool Clock_IdleState, bool Clock_Edge, uint Clock_RateKHz, SPI.SPI_module SPI_mod); } } } For each SPI device, you need to create an instance of the SPI class. When creating an instance, you have to provide an instance of the inner class SPI.Configuration to the constructor. The Configuration class holds the configuration information, such as the GPIO pin serving as the chip select as well as the other configuration parameters for communication with the SPI component. All parameters are passed to the constructor of Configuration. Please see your SPI component s data sheet for all the configuration parameters. The following parameters can be configured and provided to the constructor of the Configuration class: Cpu.Pin ChipSelect Port: This is the GPIO pin to use as the chip select for your component. bool ChipSelect_ActiveState: This is the state of the chip select that will choose and activate a device. With true, the chip select signal will be set to high for selecting a device. With false, the chip select will be set to low.

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